// 引入 connect 用于链接 UI 组件与 redux
import { connect } from "react-redux";
import {
    createIncrementAction,
    createDecrementAction,
    createIncrementAsyncAction,
} from "../../redux/actions/count";
import React, { Component } from "react";

/**
 * 定义 UI 组件
 */
class Count extends Component {
    state = { carName: "奔驰c63" };

    /**
     * 加法
     */
    increment = () => {
        const { value } = this.selectedNumber;
        this.props.jia(value * 1);
    };

    /**
     * 减法
     */
    decrement = () => {
        const { value } = this.selectedNumber;
        this.props.jian(value * 1);
    };

    /**
     * 奇数加
     */
    incrementIfOdd = () => {
        const { value } = this.selectedNumber;
        if (this.props.count % 2 !== 0) {
            this.props.jia(value * 1);
        }
    };

    /**
     * 异步加
     */
    incrementAsync = () => {
        const { value } = this.selectedNumber;
        this.props.jiaAsync(value * 1, 500);
    };

    render() {
        return (
            <div>
                <h2>我是 Count 组件,下方组件总人数为:{this.props.renshu}</h2>
                <h1>当前求和为：{this.props.count}</h1>
                <select ref={(c) => (this.selectedNumber = c)}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select>
                &nbsp;
                <button onClick={this.increment}>+</button>&nbsp;
                <button onClick={this.decrement}>-</button>&nbsp;
                <button onClick={this.incrementIfOdd}>
                    当前求和为奇数再加
                </button>
                &nbsp;
                <button onClick={this.incrementAsync}>异步加</button>&nbsp;
            </div>
        );
    }
}

/**
 * 使用 connect() 创建并暴露一个 Count 的容器组件
 */
export default connect(
    (state) => ({
        count: state.he,
        renshu: state.rens.length,
    }),
    {
        jia: createIncrementAction,
        jian: createDecrementAction,
        jiaAsync: createIncrementAsyncAction,
    }
)(Count);
